Rapid positioning and clamping tool for radial thread machining of step shaft

Abstract

The invention discloses a quick positioning and clamping tool for radial thread machining of a step shaft. The quick positioning and clamping tool comprises a step shaft assembling square block, two support plates, a positioning auxiliary assembly and a fixing assembly. An assembly hole used for containing a step shaft is horizontally formed in the step shaft assembly square block in a penetrating mode, a first positioning hole communicated with the assembly hole is vertically formed in the center of the top of the step shaft assembly square block, an arc-shaped groove perpendicular to the assembly hole is horizontally formed in the middle of the bottom of the step shaft assembly square block in a penetrating mode, and a supporting hole is formed in the center of the top of the arc-shaped groove. The two support plates are vertically fixed to the two sides, located in the axial direction of the arc-shaped groove, of the step shaft assembling square block respectively. The positioning auxiliary assembly is assembled on the top of the step shaft assembling square block and used for being matched with the first positioning hole to position the step shaft. The fixing assembly is arranged below the arc-shaped groove, connected with the two support plates and used for supporting and fixing the step shaft through the supporting holes. The device can quickly position and fasten the step shaft, does not damage the surface of the step shaft, and is suitable for various step shafts with different shaft diameters.

Description

Technical Field

[0001] This invention relates to the field of stepped shaft machining technology, and in particular to a quick positioning and clamping fixture for radial thread machining of stepped shafts. Background Technology

[0002] Stepped shafts, also known as stepped shafts, are a common type of shaft in mechanical design, often used as motor spindles and gearbox shafts. The characteristic of a stepped shaft is that the shaft body is not a single-diameter cylinder, but rather composed of multiple cylindrical segments or conical segments of different diameters and lengths connected like steps.

[0003] Machining radial threads on stepped shafts refers to machining threads whose thread axis is perpendicular to the axis of the stepped shaft. Radial threads are typically machined by tapping a radial hole within a cylindrical section of the stepped shaft. Because the thread is radial, significant radial cutting forces are generated during machining. Therefore, the key to radial thread machining is achieving high-precision radial positioning and clamping of the stepped shaft to prevent it from moving under radial forces.

[0004] In existing technologies, when machining radial threads on stepped shafts, V-blocks, chucks, or other fixtures are typically used to clamp the stepped shaft, or center rests are used with centers to fix the stepped shaft. However, the centering accuracy of V-blocks is affected by changes in shaft diameter, making it difficult to adapt to different radial references for multi-step shafts, and they are prone to minor slippage or vibration. When using custom fixtures, changing products requires readjusting or manufacturing the fixture, resulting in high costs and low efficiency. Improper control of the clamping force of chucks or custom fixtures can easily leave indentations on the shaft surface, affecting the quality of the stepped shaft parts. When using center rests with centers to fix stepped shafts, the three support jaws of the center rest need to be adjusted to perfectly fit and position with the outer circle of the shaft, often requiring multiple adjustments and trial installations, which demands a high level of operator experience and is time-consuming. Summary of the Invention

[0005] Therefore, it is necessary to provide a quick positioning and clamping fixture for machining radial threads on stepped shafts, which can quickly position and fasten the stepped shaft without damaging the surface of the stepped shaft and is adaptable to stepped shafts of various diameters.

[0006] This invention provides a quick positioning and clamping fixture for machining radial threads on a stepped shaft, comprising: The stepped shaft assembly block has a horizontally penetrating assembly hole for placing the stepped shaft inside, a first positioning hole communicating with the assembly hole is vertically opened at the top center, and an arc-shaped groove perpendicular to the assembly hole is horizontally penetrating at the bottom center. A support hole communicating with the assembly hole is opened at the top center of the arc-shaped groove. Two support plates are vertically fixed to the two sides of the stepped shaft assembly block located in the axial direction of the arc-shaped groove; The positioning auxiliary component is assembled on the top of the stepped shaft assembly block and is used to position the stepped shaft in conjunction with the first positioning hole, so that the axis of the radial threaded bottom hole of the stepped shaft coincides with the axis of the first positioning hole. The fixing component is located below the arc-shaped groove and connected to the two bracket plates. It is used to support and fix the stepped shaft after the axis of the radial threaded bottom hole coincides with the axis of the first positioning hole through the support hole.

[0007] In one embodiment, the axis of the assembly hole and the axis of the arc-shaped groove are perpendicular to and intersect with the axis of the first positioning hole, respectively. In the vertical direction, the lowest point of the assembly hole is lower than the highest point of the arc-shaped groove, and the height difference is D.

[0008] In one embodiment, the fixing assembly includes an eccentric shaft, an arc sleeve, and a clamping lever. The eccentric shaft is rotatably mounted between two support plates, and the arc sleeve is sleeved on the eccentric shaft. The clamping lever is vertically fixed to one end of the eccentric shaft. The clamping lever is used to drive the eccentric shaft to rotate, and the eccentric shaft is used to drive the arc sleeve to achieve radial movement. The arc sleeve has an annular groove in the middle along the circumference. The annular groove is used to support the stepped shaft extending downward from the support hole during the radial movement of the arc sleeve. The stepped shaft is clamped by the square enveloping assembly. The groove depth of the annular groove is less than D. When the arc sleeve moves radially under the drive of the eccentric shaft, the highest point of the bottom of the annular groove in the vertical direction is higher than the lowest point of the assembly hole.

[0009] In one embodiment, the support plate has a pivot hole, and the eccentric shaft includes a first shaft segment, a second shaft segment, and a third shaft segment that are integrally connected in sequence. The shaft diameters of the first shaft segment and the third shaft segment are equal and smaller than the shaft diameter of the second shaft segment. The axes of the first and second shaft segments coincide with the axis of the arc-shaped groove. At the connection between the first and second shaft segments, the end face circle of the first shaft segment is inscribed in the end face circle of the second shaft segment. The first and second shaft segments are respectively inserted into the rotating shaft holes of a bracket plate. The arc sleeve is fitted onto the second shaft segment, and the two ends of the arc sleeve abut against the two bracket plates respectively.

[0010] In one embodiment, the difference between the axial radius of the second shaft segment and the axial radius of the first shaft segment is e; The radius of the arc-shaped groove is greater than the axial radius of the arc sleeve, and the difference is greater than 2e and less than 2e+Dh, where h is the groove depth of the annular groove.

[0011] In one embodiment, the positioning aid component includes a first shaped bolt, a second shaped bolt, a positioning paddle, and a positioning pin; Both the first and second shaped bolts are threaded to the top of the stepped shaft assembly block; along the axial direction of the first shaft segment, the first and second shaped bolts are symmetrically arranged relative to the first positioning hole. The positioning paddle is provided with a fixing hole, a second positioning hole, and a U-shaped groove that can be sleeved on the second special-shaped bolt; along the extension direction of the positioning paddle, the fixing hole and the U-shaped groove are symmetrically arranged relative to the second positioning hole, and the positioning paddle is sleeved on the screw part of the first special-shaped bolt through the fixing hole; The diameter of the second positioning hole is equal to the diameter of the rod body of the positioning pin, and is also equal to the diameter of the radial thread bottom hole of the step shaft to be machined. The locating pin is used to position the stepped shaft to be machined by passing through the first locating hole and the second locating hole and then inserting it into the radial threaded bottom hole of the stepped shaft to be machined.

[0012] In one embodiment, the first positioning hole is an inverted frustum shape, and a step ring supporting the step shaft is sleeved inside one end of the assembly hole; The clamping lever is vertically fixed to one end of the eccentric shaft via a bushing, and the bushing is fitted onto the first shaft segment.

[0013] In one embodiment, the support plate is an L-shaped support plate; The vertical part of the L-shaped bracket plate is fixedly connected to the stepped shaft assembly block; the horizontal part of the L-shaped bracket plate is fixed to the side of its vertical part away from the arc sleeve, which is used to fix it to the drilling machine processing platform.

[0014] The beneficial effects of this invention are: (1) The tooling of the present invention places the stepped shaft through the assembly hole of the stepped shaft assembly block, and makes the axis of the radial thread bottom hole of the stepped shaft coincide with the axis of the first positioning hole by means of the positioning auxiliary component combined with the first positioning hole. Then, the fixed component can support and fix the stepped shaft after positioning, which can realize the rapid positioning and installation of the radial thread processing of the stepped shaft. (2) In this invention, the arc sleeve can move radially, so the tooling of this invention can be used for clamping radial threads of different stepped shafts and different shaft diameters. After positioning, when the fixing component supports the stepped shaft upward, the stepped shaft is clamped upward. (3) The present invention uses the annular groove of the arc sleeve to enclose the stepped shaft, and cooperates with the stepped shaft assembly block to achieve the fastening and clamping of the stepped shaft. During the entire clamping process, the arc sleeve will not leave indentations on the stepped shaft. (4) The present invention adopts the self-locking principle of eccentric shaft. The step shaft can be quickly clamped and released by simply moving the clamping lever, which saves time and effort in the assembly and disassembly process. Attached Figure Description

[0015] Figure 1A schematic diagram of the overall structure of the quick positioning and clamping fixture for machining radial threads on a stepped shaft provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the stepped shaft assembly block provided in an embodiment of the present invention; Figure 3 This is a structural schematic diagram of the stepped shaft assembly block from another angle, provided in an embodiment of the present invention. Figure 4 A schematic diagram of the assembly relationship of the quick positioning clamping fixture for machining the stepped shaft and the radial thread of the stepped shaft provided in the embodiment of the present invention; Figure 5 for Figure 4 One of the schematic cross-sectional views along the axis of the step; Figure 6 This is a schematic diagram of the structure of the eccentric shaft provided in an embodiment of the present invention; Figure 7 This is a schematic diagram illustrating the assembly relationship between the stepped shaft assembly block, the eccentric shaft, and the arc sleeve provided in an embodiment of the present invention. Figure 8 This is a schematic diagram of the structure of the arc sleeve provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the positioning lever provided in an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached drawings: 10. Stepped shaft assembly block; 11. Assembly hole; 111. Stepped ring; 12. First positioning hole; 13. Arc-shaped groove; 14. Support hole; 20. Bracket plate; 30. Eccentric shaft; 301. First shaft segment; 302. Second shaft segment; 303. Third shaft segment; 31. Arc sleeve; 311. Annular groove; 32. Clamping lever; 33. Bushing; 41. First shaped bolt; 42. Second shaped bolt; 43. Positioning lever; 431. Fixing hole; 432. Second positioning hole; 433. U-shaped groove; 44. Positioning pin; 50. Stepped shaft. Detailed Implementation

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] It should be noted that in the description of this invention, "upper," "lower," "top," "bottom," and orientation or positional relationship are based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0019] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a quick-positioning and clamping fixture for machining radial threads on a stepped shaft. It is mainly used to achieve rapid positioning and reliable clamping of the workpiece when machining radial threaded holes on the cylindrical section of a stepped shaft 50. The fixture includes a stepped shaft assembly block 10, two support plates 20, a positioning auxiliary component, and a fixing component.

[0020] The interior of the stepped shaft assembly block 10 has a horizontally penetrating assembly hole 11 for placing the stepped shaft 50. The top center has a vertically penetrating first positioning hole 12 communicating with the assembly hole 11. The bottom center has a horizontally penetrating arc-shaped groove 13 perpendicular to the assembly hole 11. The top center of the arc-shaped groove 13 has a support hole 14 communicating with the assembly hole 11.

[0021] Specifically, the arc-shaped groove 13 is connected to the assembly hole 11 through the support hole 14, and the opening of the arc-shaped groove 13 faces downward. Preferably, in this embodiment, the first positioning hole 12 is designed as an inverted frustum shape with a larger upper part and a smaller lower part, which facilitates the insertion and guidance of the positioning pin 44.

[0022] Two support plates 20 are vertically fixed to the stepped shaft assembly block 10 on both sides of the arc-shaped groove 13 along its axial direction. Specifically, in this embodiment, the support plate 20 is an L-shaped support plate 20, and each L-shaped support plate 20 includes a vertical part and a horizontal part. The top of the vertical part of the support plate 20 is flush with the top of the stepped shaft assembly block 10.

[0023] The vertical portion of the L-shaped bracket plate 20 is fixedly connected to the stepped shaft assembly block 10; the horizontal portion of the L-shaped bracket plate 20 is fixed to the side of its vertical portion away from the arc sleeve 31, that is, extending outward, so as to facilitate the fixing of the entire fixture to the drilling machine processing platform or worktable by fasteners such as T-bolts. The vertical portion of the L-shaped bracket plate 20 is provided with a pivot hole for mounting the eccentric shaft 30.

[0024] In this embodiment, a step ring 111 supporting the step shaft 50 is sleeved inside one end of the assembly hole 11. This ring supports other shaft segments of the step shaft 50, and the positioning dimensions can be adjusted according to the specific dimensions of the step shaft 50 workpiece.

[0025] The positioning auxiliary component is mounted on the top of the stepped shaft assembly block 10 and is used to position the stepped shaft 50 in conjunction with the first positioning hole 12, so that the axis of the radial threaded bottom hole of the stepped shaft 50 coincides with the axis of the first positioning hole 12. The fixing component is located below the arc-shaped groove 13 and connected to the two bracket plates 20. It is used to support and fix the stepped shaft 50 after the axis of the radial threaded bottom hole coincides with the axis of the first positioning hole 12 through the support hole 14.

[0026] The assembly relationship of the quick-positioning clamping tool for machining the stepped shaft 50 and the radial thread of the stepped shaft is as follows: Figure 4 and Figure 5 As shown, the assembly hole 11 is used to place the stepped shaft 50. By using the positioning auxiliary component to combine with the first positioning hole 12, the axis of the radial thread bottom hole of the stepped shaft 50 is made to coincide with the axis of the first positioning hole 12. Then, the fixed component can support and fix the stepped shaft 50 after positioning, which can realize the rapid positioning and installation of the radial thread machining of the stepped shaft 50.

[0027] In one embodiment, the axis of the mounting hole 11 and the axis of the arc-shaped groove 13 are perpendicular to and intersect with the axis of the first positioning hole 12, respectively. The first positioning hole 12 is located directly above the mounting hole 11 and the arc-shaped groove 13, facilitating the alignment of the radial threaded bottom hole of the stepped shaft 50 and the alignment support of the fixing assembly. In the vertical direction, the lowest point of the mounting hole 11 is lower than the highest point of the arc-shaped groove 13 by a height difference of D. Therefore, the stepped shaft 50 can extend downwards from the support hole 14 to facilitate support by the fixing assembly.

[0028] The fixing assembly is used to reliably clamp the stepped shaft 50 after positioning. The fixing assembly includes an eccentric shaft 30, an arc sleeve 31, and a clamping lever 32. The eccentric shaft 30 is rotatably mounted between two support plates 20, and the arc sleeve 31 is sleeved on the eccentric shaft 30. The clamping lever 32 is vertically fixedly mounted to one end of the eccentric shaft 30. The clamping lever 32 is used to drive the eccentric shaft 30 to rotate, and the eccentric shaft 30 is used to drive the arc sleeve 31 to achieve radial movement.

[0029] Specifically, in this embodiment, the clamping lever 32 is vertically fixed to one end of the eccentric shaft 30 via a bushing 33, and the bushing 33 is sleeved on the first shaft segment 301. For example... Figure 6 As shown, the eccentric shaft 30 includes a first shaft segment 301, a second shaft segment 302, and a third shaft segment 303 that are integrally connected in sequence. The shaft diameters of the first shaft segment 301 and the third shaft segment 303 are equal and smaller than the shaft diameter of the second shaft segment 302.

[0030] like Figure 7As shown, the axes of the first shaft segment 301 and the second shaft segment 302 both coincide with the axis of the arc-shaped groove 13. At the connection between the first shaft segment 301 and the second shaft segment 302, the end face circle of the first shaft segment 301 is tangent to the end face circle of the second shaft segment 302, meaning the second shaft segment 302 is an eccentric segment, and the axes of the first shaft segment 301 and the second shaft segment 302 do not coincide. The first shaft segment 301 and the second shaft segment 302 are respectively inserted into the rotating shaft hole of a support plate 20, so that the second shaft segment 302 is located between the two support plates 20. The arc-shaped sleeve 31 is sleeved on the second shaft segment 302 and can rotate relative to the second shaft segment 302 or rotate around its axis. The two ends of the arc-shaped sleeve 31 abut against the two support plates 20 respectively, thereby restricting the axial movement of the arc-shaped sleeve 31.

[0031] like Figure 8 As shown, an annular groove 311 is provided circumferentially in the middle of the arc sleeve 31. The cross-section of the annular groove 311 is arc-shaped. The annular groove 311 is used to support the stepped shaft 50 extending downward from the support hole 14 during the radial movement of the arc sleeve 31. It cooperates with the step shaft mounting block 10 to envelop and clamp the step shaft 50. It also fits against the outer circular surface of the step shaft 50 when clamped. Using the annular groove 311 in conjunction with the positioning plate to clamp the step shaft 50 will not leave indentations on the step shaft 50. The axial width of the annular groove 311 along the arc sleeve 31 is greater than or equal to the shaft diameter of the mounting hole 11.

[0032] The groove depth of the annular groove 311 is less than D. When the arc sleeve 31 moves radially under the drive of the eccentric shaft 30, the highest point of the bottom of the annular groove 311 in the vertical direction is higher than the lowest point of the assembly hole 11, so as to ensure that the arc sleeve 31 can apply an upward clamping force to the step shaft 50 to be processed.

[0033] The tooling of this invention is applicable to clamping radial threads on various stepped shafts. For stepped shaft segments with a diameter smaller than that of the mounting hole 11, after positioning, when the arc sleeve 31 supports the stepped shaft upwards, the stepped shaft moves upwards along the locating pin until it is clamped. Specifically, the shaft diameter R of the stepped shaft segments with radial threaded bottom holes must satisfy the condition that R is less than or equal to the diameter of the mounting hole 11, and R is greater than or equal to the diameter of the mounting hole 11 - D + the groove depth of the annular groove 311.

[0034] This embodiment adopts the self-locking principle of the eccentric shaft 30. The step shaft 50 can be quickly clamped and released by simply moving the clamping lever 32, which saves time and effort in the assembly and disassembly process.

[0035] In one embodiment, the difference between the shaft radius of the second shaft segment 302 and the shaft radius of the first shaft segment 301 is e. Specifically, in this embodiment, 1mm ≤ e ≤ 1.2mm. The groove radius of the arc-shaped groove 13 is greater than the shaft radius of the arc sleeve 31, and the difference is greater than 2e and less than 2e + Dh, where h is the groove depth of the annular groove 311. The difference between the shaft diameter of the second shaft segment 302 and the shaft radius of the first shaft segment 301 is e, and the maximum distance that the arc sleeve 31 can move radially upward from the lowest point is 2e.

[0036] For example, e=1mm, the difference between the groove radius of the arc-shaped groove 13 and the shaft radius of the arc-shaped sleeve 31 is 2.1mm, and the shaft diameter of the stepped shaft 50 to be processed is equal to the shaft diameter of the assembly hole 11. D=3mm, and the groove depth of the annular groove 311 is equal to 2.5mm. When the arc-shaped sleeve 31 moves upward to the top, the distance between the bottom of the annular groove 311 and the top of the arc-shaped groove 13 is 0.1mm. D - groove depth of the annular groove 311 = 0.5mm, which is greater than 0.1mm, so the arc-shaped sleeve 31 can self-lock with the eccentric shaft of the stepped shaft when it moves upward. It should be noted that in this example, the eccentric shaft self-locking can be formed when the arc-shaped sleeve 31 moves upward to the point where the distance between the bottom of the annular groove 311 and the top of the arc-shaped groove 13 is less than 0.5mm.

[0037] When the groove depth of the annular groove 311 is equal to D, when the arc sleeve 31 moves radially to the highest point, its top abuts against the top of the arc groove 13, and the annular groove 311 just supports the stepped shaft 50 extending from the support hole 14.

[0038] In one embodiment, the positioning auxiliary component includes a first shaped bolt 41, a second shaped bolt 42, a positioning paddle 43, and a positioning pin 44. The first shaped bolt 41 and the second shaped bolt 42 are both threaded to the top of the stepped shaft assembly block 10; along the axial direction of the first shaft segment 301, the first shaped bolt 41 and the second shaped bolt 42 are symmetrically arranged with respect to the first positioning hole 12.

[0039] like Figure 9As shown, the positioning paddle 43 is provided with a fixing hole 431, a second positioning hole 432, and a U-shaped groove 433 that can be sleeved on the second special-shaped bolt 42. Along the extending direction of the positioning paddle 43, the fixing hole 431 and the U-shaped groove 433 are symmetrically arranged relative to the second positioning hole 432. The positioning paddle 43 is sleeved on the threaded part of the first special-shaped bolt 41 through the fixing hole 431. During installation, the positioning paddle 43 is sleeved on the threaded part of the first special-shaped bolt 41 through the fixing hole 431, and can be tightened or loosened by a nut, so that the positioning paddle 43 can rotate or be fixed around the first special-shaped bolt 41. The U-shaped groove 433 is used to cooperate with the second special-shaped bolt 42. When the positioning paddle is rotated to the working position, the U-shaped groove 433 engages with the threaded part of the second special-shaped bolt 42, so as to achieve stable support for the positioning paddle 43.

[0040] In this embodiment, the diameter of the second positioning hole 432 is equal to the diameter of the rod of the positioning pin 44, and is also equal to the diameter of the radial threaded bottom hole of the stepped shaft 50 to be processed. Since the diameter of the rod of the positioning pin 44 is equal to the diameter of the radial threaded bottom hole of the stepped shaft 50 to be processed, the stepped shaft 50 can slide up and down along the positioning pin 44 after positioning.

[0041] The locating pin 44 is inserted into the radial threaded bottom hole of the stepped shaft 50 to be machined after passing through the first locating hole 12 and the second locating hole 432.

[0042] The working conditions of the quick positioning and clamping fixture for machining radial threads on a stepped shaft according to the present invention are as follows: (1) Initial state: Move the clamping lever 32 to put the eccentric shaft 30 in the relaxed position, that is, the eccentric direction of the second shaft section 302 is downward or tilted downward. At this time, the arc sleeve 31 is not in contact with the step shaft 50 to be processed. At the same time, unscrew the positioning lever 43 around the first special bolt 41 to open the top of the positioning plate.

[0043] (2) Place the workpiece: Place the step shaft 50 to be processed above the arc sleeve 31, so that the cylindrical section of the radial thread to be processed is close to the lower surface of the first positioning hole 12, and roughly align the pre-drilled thread bottom hole with the first positioning hole 12.

[0044] (3) Positioning: Rotate the positioning lever 43 to the working position so that the U-shaped groove 433 engages with the second shaped bolt 42. At this time, the second positioning hole 432 is exactly above the first positioning hole 12. Pass the positioning pin 44 through the second positioning hole 432 and the first positioning hole 12 in sequence, and continue to insert it downward into the pre-drilled threaded bottom hole on the stepped shaft 50. Since the positioning pin 44 is an transition fit with each hole, when the positioning pin 44 is smoothly inserted into the bottom hole, the position of the stepped shaft 50 is precisely fixed, and the axis of its radial threaded bottom hole coincides with the axis of the first positioning hole 12.

[0045] (4) Clamping: Keeping the locating pin 44 inserted, the clamping lever 32 is moved to rotate the eccentric shaft 30. Due to the eccentric effect of the second shaft section 302, the arc sleeve 31 gradually moves radially upward, and its annular groove 311 gradually approaches and finally presses against the outer circular surface of the stepped shaft 50. At this time, the stepped shaft 50 is clamped between the annular groove 311 of the arc sleeve 31 and the top of the inner wall of the assembly hole 11. The arc surface of the annular groove 311 fits against the shaft surface, with a large contact area and uniform pressure, and will not damage the shaft surface. At the same time, the self-locking characteristic of the eccentric shaft 30 ensures that the clamping force is continuously effective and the workpiece will not loosen.

[0046] (5) Machining: After confirming that the clamping is reliable, the locating pin 44 can be pulled out and the locating tab 43 can be unscrewed to avoid interference with machining. At this time, the drill spindle can be aligned with the first locating hole 12 for drilling or tapping operations. Due to the precise positioning, the radial threaded hole is accurately positioned.

[0047] (6) Disassembly: After the machining is completed, reverse the clamping lever 32 to lower and loosen the arc sleeve 31, and then take out the machined stepped shaft 50.

[0048] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A quick positioning and clamping tool for radial threading of stepped shafts, characterized in that, The utility model relates to a step shaft assembly block (10) is provided, and the step shaft (50) is positioned and fixed in the step shaft assembly block (10) through the positioning auxiliary assembly and the fixed assembly. The step shaft assembly block (10) includes: A step shaft assembly block (10) internally horizontally through the opening is equipped with the assembly hole (11) for placing the step shaft (50), and the top center is vertically opened and is equipped with the first positioning hole (12) that communicates with the assembly hole (11), and the bottom middle horizontally through the opening is equipped with the circular arc recess (13) that is vertically arranged with the assembly hole (11), and the top center of the circular arc recess (13) is equipped with the support hole (14) that communicates with the assembly hole (11); Two support plates (20) are vertically fixed respectively on both sides of the step shaft assembly block (10) in the axial direction of the circular arc recess (13); A positioning auxiliary assembly is assembled on the top of the step shaft assembly block (10) for positioning the step shaft (50) in cooperation with the first positioning hole (12) so that the axis of the radial threaded bottom hole of the step shaft (50) coincides with the axis of the first positioning hole (12); 2. The quick positioning fixture for radial threading of stepped shaft as claimed in claim 1 wherein, A fixed assembly is arranged below the circular arc recess (13) and connected with the two support plates (20) for supporting and fixing the step shaft (50) after the axis of the radial threaded bottom hole coincides with the axis of the first positioning hole (12) through the support hole (14). The axes of the assembly hole (11) and the circular arc recess (13) are perpendicular to and intersect with the axis of the first positioning hole (12); 3. The quick positioning fixture for radial threading of stepped shaft as claimed in claim 2 wherein, In the vertical direction, the lowest point of the assembly hole (11) is lower than the highest point of the circular arc recess (13), and the height difference is D. The fixed assembly includes an eccentric shaft (30), a circular arc sleeve (31), and a clamping tab (32). The eccentric shaft (30) is rotatably assembled in the middle of the two support plates (20). The circular arc sleeve (31) is sleeved on the eccentric shaft (30). The clamping tab (32) is vertically fixed with one end of the eccentric shaft (30). The clamping tab (32) is used to drive the eccentric shaft (30) to rotate. The eccentric shaft (30) is used to drive the circular arc sleeve (31) to move radially. The middle of the circular arc sleeve (31) is circumferentially provided with an annular groove (311). The annular groove (311) is used to support the step shaft (50) extending downward from the support hole (14) during the radial movement of the circular arc sleeve (31), and to cooperate with the step shaft assembly block (10) to clamp the step shaft (50).

4. The quick positioning fixture for radial threading of stepped shaft as claimed in claim 3 wherein, The groove depth of the annular groove (311) is less than D. When the circular arc sleeve (31) moves radially under the drive of the eccentric shaft (30), the highest point of the groove bottom of the annular groove (311) in the vertical direction is higher than the lowest point of the assembly hole (11). The support plate (20) is provided with a shaft hole. The eccentric shaft (30) includes a first shaft segment (301), a second shaft segment (302), and a third shaft segment (303) connected in sequence. The shaft diameters of the first shaft segment (301) and the third shaft segment (303) are equal and smaller than the shaft diameter of the second shaft segment (302). The axis of the first shaft segment (301) and the second shaft segment (302) coincides with the axis of the circular-arc-shaped groove (13), and the end face of the first shaft segment (301) is inscribed in the end face of the second shaft segment (302) at the connection between the first shaft segment (301) and the second shaft segment (302); The first shaft segment (301) and the second shaft segment (302) are respectively inserted into the rotating shaft hole of a support plate (20), and the circular-arc-shaped sleeve (31) is sleeved on the second shaft segment (302), and the two ends of the circular-arc-shaped sleeve (31) are respectively abutted against two support plates (20).

5. The quick positioning fixture for radial threading of stepped shaft as claimed in claim 4 wherein, The difference between the shaft radius of the second shaft segment (302) and the shaft radius of the first shaft segment (301) is e; The groove radius of the circular-arc-shaped groove (13) is greater than the shaft radius of the circular-arc-shaped sleeve (31), and the difference is greater than or equal to 2e and less than 2e+D-h, where h is the groove depth of the annular groove (311).

6. The quick positioning fixture for radial threading of stepped shaft as claimed in claim 5 wherein, The positioning auxiliary assembly comprises a first profiled bolt (41), a second profiled bolt (42), a positioning tab (43), and a positioning pin (44); The first profiled bolt (41) and the second profiled bolt (42) are both threadedly connected to the top of the stepped shaft assembly block (10); along the axis direction of the first shaft segment (301), the first profiled bolt (41) and the second profiled bolt (42) are symmetrically arranged relative to the first positioning hole (12); The positioning tab (43) is provided with a fixing hole (431), a second positioning hole (432), and a U-shaped groove (433) which can be sleeved on the second profiled bolt (42); along the extension direction of the positioning tab (43), the fixing hole (431) and the U-shaped groove (433) are symmetrically arranged relative to the second positioning hole (432), and the positioning tab (43) is sleeved on the shank portion of the first profiled bolt (41) through the fixing hole (431); The hole diameter of the second positioning hole (432) is equal to the shank diameter of the positioning pin (44), and is equal to the shaft diameter of the radial threaded bottom hole of the stepped shaft (50) to be machined; The positioning pin (44) is used to be inserted into the radial threaded bottom hole of the stepped shaft (50) to be machined after passing through the first positioning hole (12) and the second positioning hole (432), so as to position the stepped shaft (50) to be machined.

7. The quick positioning fixture for radial threading of stepped shaft as claimed in claim 6 wherein, The first positioning hole (12) is a reverse conical frustum, and one end of the assembly hole (11) is internally sleeved with a stepped ring (111) for supporting the stepped shaft (50). The clamping tab (32) is vertically fixedly assembled with one end of the eccentric shaft (30) through a shaft sleeve (33), and the shaft sleeve (33) is sleeved on the first shaft segment (301).

8. The quick positioning fixture for radial threading of stepped shaft as claimed in claim 7 wherein, The support plate (20) is an L-shaped support plate (20); The vertical part of the L-shaped support plate (20) is fixedly connected with the stepped shaft assembly block (10), and the horizontal parts of the L-shaped support plate (20) are fixed to the side of the vertical part away from the circular-arc-shaped sleeve (31), and are used for being fixed with a drilling machine processing platform.

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